Other mistake: In modern time Natalie Vasquez dies in episode 13 and her character is just discontinued. In flashbacks after that episode she's never seen again. She's not even seen at the graduation day of the trainees, but we see her at the Grand Central bombing, which supposedly happened just days after the trainees became agents.
Continuity mistake: When Dr. Susan Langdon and Simon are sitting while she eats a hamburger, she doesn't have a gold wedding band on her finger. As the scene continues and she takes a bite, a wedding band appears on her finger. When the scene ends, once again she doesn't have the gold wedding band on her finger. (00:39:00 - 00:42:00)Snag.1